Extech Instruments ExStik EC500, User Manual

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Troubleshooting
Problem Possible Cause Action
Reading is frozen Press MODE/HOLD key to
exit
BAT message Batteries are low Replace batteries
Unit will not calibrate in pH Low pH slope Replace electrode, see
reorder information
Unit will not calibrate in pH Clogged or contaminated
reference junction Clean junction (see
cleaning instructions)
Unit will not calibrate in pH Damaged or worn out
sensing membrane Replace electrode, see
reorder information
Unit will not calibrate in pH Contaminated pH buffers Use fresh buffers
Unit will not calibrate in
conductivity mode Contaminated conductivity
standards Use fresh standards
Unit will not calibrate in
conductivity mode Dirty probe Clean conductivity probe
(See cleaning instructions)
Unit will not calibrate in
conductivity mode Damaged conductivity probe Replace electrode, see
reorder information
Unit will not calibrate in
conductivity mode Trapped air bubbles Tap or stir to release air
bubbles
Unit will not turn on Batteries are low or dead Replace batteries
Unit will not turn on Batteries installed with
incorrect polarity Replace batteries,
observe polarity
pH sensor needs
recalibration Recalibrate unit
Use fresh buffers
pH sensor slope has fallen
below acceptable limits Replace electrode, see
reorder information
Unit will not respond to any
key presses Internal fault Perform hard reboot:
Remove batteries, hold
ON/OFF switch down for 5
seconds, replace batteries
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